water/bleach
Baking does work well if the piece will fit in the oven. The high heat kills anything. If it won't fit in an oven do the bleach method. It does not take much bleach to kill bacteria. A couple of drops of bleach in a well or cistern will kill the bad stuff and keep it safe for drinking. A weak bleach solution sprayed on the branches and left on for 10 minutes will kill everything bad. Spray it off really well and let it dry in the sun. Bleach degrades quickly into harmless components when mixed with water. I am going to be doing a major cage cleaning project today. I'm going to clean about ten cages, all the manzanita wood climbing branches in them and any potted plants I decide to use again. I use a bleach/water solution and rinse it off well. I do this on my patio. The bleach/water solution runs directly off into my flower beds. I've done this for years and never killed a plant as long as I rinse them off after I clean the cages. Just rinse, rinse, rinse...........